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    Bonding

    Behaviour of phosphorus pentachloride (PCl5)

    PCl5 is a white solid, which volatilises at 160oC and melts at 148oC under pressure. Molten PCl5 conducts an electric current readily. At 180oC PCl5 vapour has a density of 9.3 g/L corrected to the standard conditions. At 250oC a sample of PCl5 exerts a pressure, which is twice the expected value. Discuss these observations and

    Peptide Bonds

    Draw the peptide Asn-Val-Ile-Cys and list the number of peptide bonds and what type of peptide is it (dipeptide, tripeptide etc...)?

    Identifying and drawing structures with functional groups.

    The recognition of functional groups is essential for understanding chemistry and biochemistry. For the functional groups listed below, draw the structure of a molecule that contains that type of functional group. (a) Amine (b) Carboxylic acid (c) Two double bonds (d) Both a ketone and an amine (e) Alcohol